Norway: DNV Develops New Deep-Water Pipeline Concept

Norway - DNV Develops New Deep-Water Pipeline Concept

DNV has developed a new pipeline concept, called X-Stream, that can significantly reduce the cost of a deep- and ultra-deepwater gas pipeline while still complying with the strictest safety and integrity regime. X-Stream is based on established and field-proven technologies which have been innovatively arranged.

X-Stream can reduce both the pipeline wall thickness and time spent on welding and installation compared to deep-water gas pipelines currently in operation. The exact reduction in the wall thickness depends on the water depth, pipe diameter and actual pipeline profile. Typically, for a gas pipeline in water depths of 2,500 m, the wall thickness reduction can be 25 to 30 % compared to traditional designs.

“It’s essential for DNV that the new concept meets the strict requirements of the existing safety and integrity regime, and I’m pleased to confirm that this concept does,” says Dr. Henrik O. Madsen, DNV’s CEO, who announced the news at a press briefing in London today.

“DNV has been instrumental in developing and upgrading the safety and integrity regime and standards for offshore pipelines over the past decades. Today, more than 65 % of the world’s offshore pipelines are designed and installed to DNV’s offshore pipeline standard. As the deep-water gas transportation market will experience massive investments and considerable growth over the coming years, new safe and cost-efficient solutions are needed,” Dr. Madsen adds.

Current deep-water gas pipelines have thick walls and, due to quality and safety requirements, the number of pipe mills capable of producing the pipe is limited. When installing pipelines, the heavy weights are difficult to handle and the thick walls are challenging to weld. And finally, the number of pipe-laying vessels for deep-water pipelines is limited too.

New offshore oil and gas fields are being developed in deeper and deeper waters and export solutions for the gas are critical. New exploration activities are also heading for ultra-deepwaters. The distance to shore is increasing too. The X-Stream concept can for such fields represent an alternative to e.g. floating LNG plants combined with LNG shuttle tankers.

By controlling the pressure differential between the pipeline’s external and internal pressures at all times, the amount of steel and thickness of the pipe wall can be reduced by as much as 25-30 % – or even more compared to today’s practice and depending on the actual project and its parameters. This will of course make it easier and cheaper to manufacture and install the pipeline.

“By utilising an inverted High Pressure Protection System – i-HIPPS – and inverted Double Block and Bleed valves – i-DBB – the system immediately and effectively isolates the deep-water pipe if the pressure starts to fall. In this way, the internal pipeline pressure is maintained above a critical level for any length of time,” explains Asle Venås, DNV’s Global Pipeline Director.

The new concept is simple and reliable. During installation, it is necessary to fully or partially flood the pipeline to control its differential pressure. During operation, the i-HIPPS and i-DBB systems ensure that the pipeline’s internal pressure can never drop below the collapse pressure – plus a safety margin. In sum – a certain minimum pressure will be maintained in the pipeline at all times.

“It will also be important to maintain the minimum pressure in the pipeline during pre-commissioning. This can be done using produced gas separated from the water in the pipe by a set of separation pigs and gel. This technology is not new to the industry. This method has already been initiated as standard practice by several oil companies,” says Mr Venås.

A team of mainly young highly skilled engineers, headed by DNV in Rio de Janeiro, Brazil, is behind the X-Stream concept. As with the other DNV concepts launched in 2010 and 2011, the X-Stream team was asked to think outside the box.

The DNV study is a concept study, and a basic and detailed design will need to be carried out before the X-Stream concept is realised on a real project. DNV intends to work further with the industry to refine and test the concept.

“I’m pleased to announce the outcome of this innovation project. At DNV, we feel confident that, by further qualifying the X-Stream concept, huge financial savings can be made for long distance, deep-water gas pipelines without compromising pipeline safety and integrity,” concludes Dr. Madsen.

World Maritime News Staff, January 20, 2012; Image: DNV


Share this article

Follow World Maritime News

In Depth>


<< Nov 2015 >>
26 27 28 29 30 31 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 1 2 3 4 5 6

Salvage Law & Practice Seminar

Salvage Law & Practice at a glance:
Lloyd’s Open Form – contract design, administration and recent cases
special compensation awards…

read more >

CWC Sixteenth World LNG Summit & Awards Gala Dinner

The summit will provide a perfect opportunity to understand how key players are responding to the price fluctuations and what the outlook…

read more >

International WorkBoat Show

The event offers considerable opportunities to participating business houses to strengthen their business networks, and get familiar with…

read more >

Marintec China 2015, Shanghai, China


Facts & Figures of Marintec China:
• The exhibition spread over 70,000 square metres in Shanghai New International Expo Centre
• Over 1,700 exhibiting companies were participating in the event
• 57,888 quality trade visitors from 88 countries/regions
• 16 national & regional pavilions from Austria, China, Denmark, Finland, France, Germany, Hong Kong SAR, Japan, Korea, the Netherlands, Norway, Singapore, Sweden, Taiwan region, the United States and the United Kingdom were organised

About Marintec China

Marintec China 2015 will be held on 1-4 December 2015 in Shanghai. With increasing worldwide recognition and reputation throughout the past three decades, the exhibition is attracting an increasing number of high-profile exhibitors and visitors from around the world.

Regarded as the only gateway to the Asian maritime market, Marinetech China has become larger than ever! Being the most recognized maritime trade show in Asia, Marintec China is definitely an international marketplace for buyers to source from international sellers showcasing their latest marine, ship design, offshore engineering and port technology.

Over the years, Marintec China has grown to reflect the size and importance of the Asian maritime market. Marintec China 2013 has broken all the previous records attracting more than 1,700 exhibiting companies from 32 countries /regions and 16 group pavilions, making it the most international and authorised industry event in Asia. Taking place once every two years, Marintec China 2015 edition is a unique opportunity for suppliers to connect with new customers and re-connect with existing contacts from the region, and final one to present new products and services to the trade visitors and experts from all parts of the world.

Visit Marintec China 2015 website for more details

read more >